Cord belt



Aug. 7, 1928. 1,679,575

N. E. KIMBALL CORD BELT Filed Dec. 4, 1925 glu-veniva Patented Aug. 7, 192g.

NOBRIS E. KIMBALL, 0F if N, OHIO, ASSIGNOR TO TEE GOODYEAR TIRE & RUBBER. COMPANY, OF N, OHIO, A CORPORATION 0F OHIO.

CORD BELT.

Original application med vSeptember' 19, 1924, Serial No. 738,803. Divided and this application tiled December 4, 1925.

My invention relates to improvements. in endless cord belts and methods lof, making vthe same and it particularly pertains to belts that are adapted to be used for the transmission 'ofpower to automobile fans and the like. l

Heretofore, the manufacture of endless belts of fabric has been proposed wherein a bias-cut band of cross-woven fabric was wound longitudinally upon itself over a cylindrical core lmember to provide the belt. It has also heretofore been proposed to Wind a multiplicity of turns of a rubber impregnated cord upon a mandrel and to encase the core thus formed in4 a fabric sheath, after which vulcanization is effected to form an endless fiat cord belt. The' former method of manufacture produces a woven fabric belt of circular cross-section, whereas the latter method produces a fiat cord belt.

My invention differs from the above practice in that I propose a method of makin a novel cord belt of substantially circu ar cross-section, in which the cord strands extend longitudinally of the core of the belt. The method is claimed in copending apphcation, Serial Number 738,603, iiled September 19, 1924, of which the instant case 1s a division.

My invention also contemplates an inexpensive cord belt, clai-med herein, that, by

reason of 'its form, has the combined advantages of a fiat belt and of va belt of circular cross-section.

Fig. 1 of the accompanying drawings is a plan view of a strip of cord fabric that is adapted to be used in'the manufacture of a cord center for the belt herein described;

Fig. 2 shows the cord strip illustrated in Fig. 1 wound into a band that is subsequently to be formed into a belt;

Fig. 3 is a lateral sectional view of the band shown in Fig. 2 after the belt has been partially formed;

Fig. 4 is a cross-sectional view of the belt after it is in final assembled condition prior to vulcanization; and

Fig. 5 shows the belt after finalvulcaniaation and as vused in service in association with a driving pulley.

The strip of cord fabric that'is shown in Figs. l and 2 may be of any suitable type of Serial No. 73,221. Y

rubber impregnated cord fabric that has a series of cord elements 1 extending longitudinally of the fabric. The respective ends of the strip are cut on the bias, as indicated,

in order to distribute the line of the splice After the band shown in F ig. 2 is formed,

it is rolled upon itself, as indicated by the lateral sectional view of Fig. 3, until 'it forms an endless ring of circular cross-section. A sheath 12 of square-woven fabric that is cut on the bias is then wound on the cord center in accordance with customary practice. A rubber jacket 13 is formed over the fabric sheath 12 to protect the fabric layersl of the belt from mechanical injury. The belt isthen placed under slight tensiony in a mold and vulcanized under pressure into the oros-sectional form shown in Fig. 5. l

The-two .angularly disposed faces 15 and 16, that are thus formed on the belt during vulcanization, provide an extensive surface of engagement with the driving face of a V-sha d ulley 17, such as customarily is used or'tie operation of fan belts for automobiles and the like. This particular crossfsectional-shape ofthe belt gives all of the operating advantages of a flat fan belt,

qualities of a belt of round cross-sztion. The gripping and wear-resisting qualities of the belt are greatly improved by thus flattening the sides of the belt.

The advantages inherent in a belt of this together with the most desirable operating general type are manifold. lAll of the ad-y i vantages of the flat cord belt are obtained in a belt of substantially circular section that is much less expensive to manufacture than j a cord belt of the flat form that is made, in accordance with customary practice, from a continuous length of cord.

By providing a belt having a substantially circular cross-sectional area, uniform distribution of stresses within the belt has been obtained. B providing plane faces at the sides of the elt, the tractive eect between l0 sults an undesirable deformation of the oen- -the elements thereof tangent to-the grooves of the pulley Wear away irregularly, allowing the belt to slide down into the groove,

Aresulting in loosening of the belt and indecreasing the power transmitted. When a belt of trapezoidal shape is utilized there retral portion of the belt toward the center of the pulley which is entirely overcome by the form of belt herein disclosed.

rlhe particular combination of belt Velements, i. e. a core of circular section made up of cord elements surrounded by a body of cross-vvoven fabricy and an outside wear-re-l sisting surface layer of rubber composition molded to a particular Jtorin isalso a feature of my invention that produces a belt having vmany superior characteristics.

Although ll have described and illustrated l" only a single preferred form of my invention, it is evident that many modications of this preferred form may be made without departing from the spirit and scope of m invention. l desire, therefore, that only suc 1. A belt having a pair of plane pulley engaging faces and convex inner and outer faces. 4

2. A. belt of rubber and fabric compris a core having a substantially circular cross section and an envelope ot' resilient material formed with `inner and outer convex surfaces and opposed tapered plane pulley engaging faces.

ln Witness whereof,.l[ have hereunto signed my name. f

NRRIS E. l z 

